In Transformers: Robots in Disguise, the Autobots are the main race on Cybertron, and their enemies are the Predacons. The Autobots fought in the Cybertronian Civil Wars, presumably against the Predacons. Vector Sigma, the Allspark, chooses which Autobot is to be granted the Matrix and thus the position of commander-in-chief.
The Autobots were already on Earth when the Predacons arrived, having taken the form of Earth vehicles to work as camouflage and established a Global space bridge network and a central base monitoring the entire planet.
In their disguises, the Autobots integrated themselves into human society; Team Bullet Train worked as actual trains, X-Brawn was owned as a car by Kelly, and Optimus Prime was working for a fire department. This continued after they went public; both Prowl and Tow-Line, for example, were shown enforcing human laws in an apparently official capacity, suggesting the Autobots had official ties to human authorities.
It's known Optimus fought the Predacons on other worlds, presumably using the same tactics as on Earth.
Read more about this topic: Autobot
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